Q-Bahn (U-Bahn Octoquadri)
(Eingestellt am 9. Mai 2025, 20:12 Uhr von the_cogito)
Zetamath recently hosted a setting challenge for setters to submit octoquadris. My original submission had some issues which I decided to go back and fix before publishing. I hope you like it.
Rules:
- Within the left U-bahn grid, draw a totally connected loop network through the centers of some cells, which may branch or turn, but may not have any dead ends.
- A clue outside the U-bahn grid indicates how many times the corresponding line shape (i.e. a cross, branch, straight line, turn) appears in the corresponding row or column, irrespective of the line shape's rotation.
- In the U-bahn grid, assign each line shape (irrespective of rotation) a digit from 1-4 as follows: corner=1, straight line=2, branch=3, cross=4.
- In the right Octoquadri grid, place eight of the digits from 1-9, twice each in the grid, such that no digit appears more than once in each row, column, or 2x2 region. Digits along a green german whisper line must differ by at least 5.
- Each cell in the Octoquadri grid corresponds to a 2x2 region in the U-bahn grid. Digits in the Octoquadri grid indicate the the sum of U-bahn 'digits' in the corresponding U-bahn region.
Solve on Penpa+
Solve on SudokuPad (no answer check)
Lösungscode: For every row except the bottom, the number of loop segments extending down from that row.
Gelöst von Agent, KNT, tuturitu, jkuo7, Mr_tn, Christounet, sfushidahardy, lupo, tonald, Jesper, Bellsita, ibag, askaksaksask, polar, Zzzyxas, itweb, steeto, tuace, ns08
Kommentare
am 25. Mai 2025, 20:27 Uhr von askaksaksask
Such fun! A great opening sequence, followed by a fun mid-solve to untwist. A very well-directed puzzle (a nod to very clear, sharp setting) with a few really great steps mixed in. Great puzzle. Thank you!
am 18. Mai 2025, 22:54 Uhr von ibag
Wunderschönes Rätsel!
am 13. Mai 2025, 23:18 Uhr von lupo
Ein echter Hirnverzwirner (ich habe mehrere Anläufe gebraucht, um meines zu entzwirnen). Tolles Rätsel, und bis zum Schluss spannend.
am 12. Mai 2025, 14:04 Uhr von sfushidahardy
Lovely puzzle! The previous version I was lucky to test was already great, but this really perfected the idea.
am 12. Mai 2025, 09:53 Uhr von Christounet
So cool! Nice looking symmetry indeed. Thanks :)
am 9. Mai 2025, 21:36 Uhr von KNT
cool symmetry
am 9. Mai 2025, 21:35 Uhr von Agent
Cool puzzle with a clever break-in!